This is a key moment in this story. The beginning of John 1 explained that the Lord is perfect, infinite love which gave itself expression as divine truth. The duality of love and expression formed a template for humanity, which meant that the Lord’s duality made him the ultimate, divine human. It showed that the divine truth was the power of creation, and that the Lord shared that truth with humanity from the outset, so that people could receive His love and return it. But people kept turning away, and the Lord had to keep expressing his love in more and more external forms to maintain a connection.

By mentioning John the Baptist, the chapter showed that the Jews of the time still had the truth – the Lord’s Word – contained inside the rough-hewn images of the Old Testament. But they were so steeped in evil loves and false thinking that the connection to the Word – to the love within the Old Testament – was about to be snipped forever.

So the Word became flesh. The Lord passed the full expression of His love and His full humanity into physical flesh as Jesus. That way He could once again show the life within the existing Scriptures and could make His own life and His own words part of an expanded expression of truth for a new age of humanity. People could no longer see and feel the Lord’s love through the Old Testament, but they could see and feel it in the face and hands and words of Jesus.

The "glory" here expresses the blinding brilliance of that truth. The "Father" represents the Lord’s actual love itself, and being "begotten" means that the love was expressed in the form of truth. Being full of "truth" has a pretty obvious meaning, but "grace" means an affection, a love for what is true.

The Lord had to come. He had to let His humanity flow down into the flesh, into the most external of forms, because that was the only way we were going to see and embrace it.

(References: A Brief Explanation of the Teachings of the New Church 117; The Apocalypse Explained 1069 [3]; The Word 20; True Christian Religion 3, 85)

820. 19:11 Then I saw heaven opened, and behold, a white horse. This symbolizes the spiritual sense of the Word revealed by the Lord and the deeper meaning of the Word thereby disclosed, which is the coming of the Lord.

Seeing heaven opened symbolizes a revelation by the Lord and a disclosure then, which we will take up below. A horse symbolizes an understanding of the Word, and a white horse a deeper understanding (no. 298). And because this is the symbolic meaning of a white horse, and a deeper understanding of the Word is an understanding of the spiritual sense, therefore that sense is here symbolized by the white horse.

This is the coming of the Lord, because that sense makes it clearly apparent that the Lord embodies the Word, that the Word deals with Him alone, that He is God of heaven and earth, and that the New Church originates from Him alone.

The Lord told His disciples that they would see the Son of Man coming on the clouds of heaven with glory and power (Matthew 17:5; 24:30; 26:64; Mark 14:61-62; Revelation 1:7; Acts of the Apostles 1:9, 11). And the Lord said this also when He spoke with His disciples about the culmination of the age, which is the final period of the church when a judgment takes place.

Everyone who does not think beyond the literal sense believes that when the Last Judgment arrives, the Lord will appear in clouds of the sky, accompanied by angels and the blowing of trumpets. But this is not the meaning. Rather it means that the Lord will appear in the Word, as can be seen from the exposition above in nos. 24 and 642, and He appears clearly in the Word's spiritual sense. He appears not only as being an embodiment of the Word, that is, of Divine truth itself, or as being inmostly present in the Word and in everything springing from it, but also as being a single God, having the Trinity in Him, thus as being the only God of heaven and earth. Moreover, it appears also that He came into the world to glorify His humanity, that is, to make it Divine.

[2] The humanity that the Lord glorified, that is, the humanity that He made Divine, was the natural humanity, which He could not glorify or make Divine except by taking on a humanity in a virgin in the natural world, to which He then united His Divinity which He had from eternity. This union was achieved by temptations suffered by the humanity He had taken on, the last of which was His suffering of the cross and at the same time His fulfilling all of the Word, not only by His fulfilling all of the Word in its natural sense, but also by His fulfilling all of the Word in its spiritual sense, and also in its celestial sense, which, as we said before, deals with Him alone.

But on this subject see what we disclosed in The Doctrine of the New Jerusalem Regarding the Lord, and in The Doctrine of the New Jerusalem Regarding the Sacred Scripture.

Now because the Lord embodies the Word, and the Word became flesh (John 1:1-2, 14), and the Word became flesh in order that He might fulfill it, it is apparent that the Lord's appearing on the clouds of heaven means His coming in the Word. That the clouds of heaven symbolize the Word in its literal sense may be seen in nos. 24 and 642 above.

It is apparent that it is the Lord's appearing in the Word that is meant, because the white horse symbolizes a deeper understanding of the Word, and we are told that the name of Him who sat on the horse is "The Word of God," and that His name is "King of kings and Lord of lords" (verses 13, 16).

[3] It is apparent from this now that John's seeing heaven opened, and behold, a white horse, symbolizes the spiritual sense of the Word revealed by the Lord and the deeper meaning of the Word thereby disclosed, which is the coming of the Lord.

That the Word's spiritual sense has at this day been revealed, which no one in the Christian world has previously known anything about, may be see in Arcana Coelestia (The Secrets of Heaven), in which we expounded two of the books of Moses - Genesis and Exodus - in accordance with that sense. It may be seen also in The Doctrine of the New Jerusalem Regarding the Sacred Scripture, nos. 5-26; in the short treatise, The White Horse, from beginning to end, and from the numbers collected there from Arcana Coelestia regarding the sacred scripture; and furthermore in this exposition of the book of Revelation, in which not even one little verse can be understood apart from its spiritual meaning.